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Am J Physiol Gastrointest Liver Physiol 252: G436-G438, 1987;
0193-1857/87 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 252, Issue 3 436-G438, Copyright © 1987 by American Physiological Society

ARTICLES

Simultaneous measurements of 22Na and 36Cl in aqueous samples: a comparison of three different methods

P. K. Rangachari and D. McWade

We have critically analyzed three methods that measure the combined presence of 36Cl and 22Na in aqueous samples. These were a sequential method, a dual-label spectral analysis method (Beckman 1983), and a AgNO3 precipitation method (Thompson 1983). The former requires the use of both a gamma counter and a beta liquid scintillation counter, whereas the latter two require access to a beta counter only. Our analysis suggests that investigators who have access to both a liquid scintillation counter and a gamma spectrometer would find the sequential method relatively simple to use and reasonably reliable. Those with access to only a liquid scintillation counter would be best advised to use the AgNO3 method described by Thompson.




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